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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*-
26: * Copyright (c) 1988 University of Utah.
27: * Copyright (c) 1982, 1986, 1990, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * This code is derived from software contributed to Berkeley by
31: * the Systems Programming Group of the University of Utah Computer
32: * Science Department, and code derived from software contributed to
33: * Berkeley by William Jolitz.
34: *
35: * Redistribution and use in source and binary forms, with or without
36: * modification, are permitted provided that the following conditions
37: * are met:
38: * 1. Redistributions of source code must retain the above copyright
39: * notice, this list of conditions and the following disclaimer.
40: * 2. Redistributions in binary form must reproduce the above copyright
41: * notice, this list of conditions and the following disclaimer in the
42: * documentation and/or other materials provided with the distribution.
43: * 3. All advertising materials mentioning features or use of this software
44: * must display the following acknowledgement:
45: * This product includes software developed by the University of
46: * California, Berkeley and its contributors.
47: * 4. Neither the name of the University nor the names of its contributors
48: * may be used to endorse or promote products derived from this software
49: * without specific prior written permission.
50: *
51: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61: * SUCH DAMAGE.
62: *
63: * from: Utah $Hdr: mem.c 1.13 89/10/08$
64: * @(#)mem.c 8.1 (Berkeley) 6/11/93
65: */
66:
67: #include <mach_load.h>
68:
69: /*
70: * Memory special file
71: */
72:
73: #include <sys/param.h>
74: #include <sys/dir.h>
75: #include <sys/proc.h>
76: #include <sys/buf.h>
77: #include <sys/systm.h>
78: #include <sys/vm.h>
79: #include <sys/uio.h>
80:
81: #include <vm/vm_map.h>
82: #include <vm/vm_kern.h>
83: #include <mach/vm_param.h>
84:
85: extern int loadpt;
86:
87: mmread(dev, uio)
88: dev_t dev;
89: struct uio *uio;
90: {
91:
92: return (mmrw(dev, uio, UIO_READ));
93: }
94:
95: mmwrite(dev, uio)
96: dev_t dev;
97: struct uio *uio;
98: {
99:
100: return (mmrw(dev, uio, UIO_WRITE));
101: }
102:
103: mmrw(dev, uio, rw)
104: dev_t dev;
105: struct uio *uio;
106: enum uio_rw rw;
107: {
108: register int o;
109: register u_int c, v;
110: register struct iovec *iov;
111: int error = 0;
112: vm_offset_t where;
113: int spl;
114:
115:
116: while (uio->uio_resid > 0 && error == 0) {
117: iov = uio->uio_iov;
118: if (iov->iov_len == 0) {
119: uio->uio_iov++;
120: uio->uio_iovcnt--;
121: if (uio->uio_iovcnt < 0)
122: panic("mmrw");
123: continue;
124: }
125: switch (minor(dev)) {
126:
127: /* minor device 0 is physical memory */
128: case 0:
129: #if MACH_LOAD
130: v = trunc_page(uio->uio_offset + loadpt);
131: #else MACH_LOAD
132: v = trunc_page(uio->uio_offset);
133: #endif MACH_LOAD
134: if (uio->uio_offset >= mem_size)
135: goto fault;
136:
137: spl = splvm();
138: where = vm_map_min(kernel_map);
139: if (vm_map_find(kernel_map, VM_OBJECT_NULL,
140: (vm_offset_t) 0, &where, PAGE_SIZE, TRUE) != KERN_SUCCESS) {
141: splx(spl);
142: goto fault;
143: }
144: pmap_enter(vm_map_pmap(kernel_map), where, v,
145: VM_PROT_READ|VM_PROT_WRITE, TRUE);
146: #if MACH_LOAD
147: o = (uio->uio_offset + loadpt) - v;
148: #else MACH_LOAD
149: o = uio->uio_offset - v;
150: #endif MACH_LOAD
151: c = min(PAGE_SIZE - o, (u_int)iov->iov_len);
152: error = uiomove((caddr_t) (where + o), c, uio);
153: vm_map_remove(kernel_map, where, where + PAGE_SIZE);
154: splx(spl);
155: continue;
156:
157: /* minor device 1 is kernel memory */
158: case 1:
159: /* Do some sanity checking */
160: if (((caddr_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) ||
161: ((caddr_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS))
162: goto fault;
163: c = iov->iov_len;
164: error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
165: continue;
166:
167: /* minor device 2 is EOF/RATHOLE */
168: case 2:
169: if (rw == UIO_READ)
170: return (0);
171: c = iov->iov_len;
172: break;
173: default:
174: goto fault;
175: break;
176: }
177:
178: if (error)
179: break;
180: iov->iov_base += c;
181: iov->iov_len -= c;
182: uio->uio_offset += c;
183: uio->uio_resid -= c;
184: }
185: return (error);
186: fault:
187: return (EFAULT);
188: }
189:
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